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My very large return grill is on the top of an eight foot wall that prohibits me from putting any pictures on that wall. I want to lower the grill to the bottom of the wall. What effect does bringing the return from the top to the bottom have on efficiency?

Return Duct

Dash,
Thanks for the reply. Yes, it is simply a 2x4 wall and the draw is top to bottom. The return grill is a 20x20 inch and is quite unsightly in such a small, predominant space and thus the reason to want to move it down. Will it suffer if I went to a smaller grill (16x6)? Thanks.

Duct Return

The wall itself is approx. 60" wide and 8' high (2x4 studs). Haven't peered down the wall yet. Weekend project is to remove and replace part of the sheet rock (big crack) and, while doing so, move the grill down; thus the inquiries. Will there be (or should there be) duct work in the wall? If there is, I will pare that down to make the grill work.